不同粒径煤矸石温度场影响下重构土壤水分时空响应特征

Temporal and spatial response characteristics of reconstructed soil moisture under different particle size coal gangue temperature field

为研究煤矸石基质风化过程中温度场变化引起的充填复垦重构土壤水分时空响应特征,选取不同粒径级配同等覆土厚度的煤矸石充填复垦田间试验小区,分层分区埋设温度和湿度传感器,动态监测重构土壤不同梯度的温度及水分。实验结果表明:煤矸石层及充填界面温度总体低于土壤剖面15 cm(H1层),25 cm(H2层)处温度,高于35 cm(H3层)处土壤温度,说明地表热传导作用于H1,H2层土壤,但是在充填界面上存在由煤矸石风化作用引起的温度场变化演替现象;复垦地土壤水分随土壤深度的增加而降低,各复垦地土壤水分总体分布趋势为中粗粒径>细粒径>粗粒径,中粗粒径和细粒径复垦地块土壤水分平均差异值为3.7%;H3层土壤温度与煤矸石层温度相关性最高;试验地各层土壤水分与煤矸石层温度相关系数大小呈H3>H2>H1;各复垦地土壤温度与水分相关性显著,粗粒径复垦地块的平均相关性系数为0.716,中粗粒径复垦地块的平均相关性系数为0.668,细粒径复垦地块的平均相关性系数为0.626。

For studying the temporal and spatial response characteristics of reconstructed soil moisture under different particle size coal gangue temperature field,construct the experimental field by filling coal gangue with different particle size distribution and the same equal overburden thickness,the hierarchical embedded high precision temperature and moisture sensor,a soil moisture monitoring station,the dynamic monitoring of soil moisture and temperature gradient reconstruction.The experimental results show that The temperature of coal gangue and filling interface is generally lower than the soil temperature of 15 cm（ H1 layer） and 25 cm（ H2 layer）,and higher than the soil temperature at 35 cm（ H3 layer）.That indicates the surface heat conduction acts on soil layers H1 and H2,but the temperature field caused by weathering of coal gangue exists on the filling interface Change the succession phenomenon; the soil moisture of reclaimed land degrades with the increase of soil depth,the land reclamation reconstruction of soil moisture for the overall distribution trend is medium particle〉fine particle 〉coarse particle,medium particle and fine particle of reclaimed land soil moisture average difference value is 3.7%; the correlation between the soil temperature in H3 layer and the temperature of gangue layer is the highest.; the correlation coefficient between soil water content and coal gangue temperature is H3〉H2〉H1; the average correlation coefficient of coarse particle of the reclaimed land was 0.716,the average correlation coefficient in the medium particle reclaimed land is 0. 668,the average correlation coefficient of fine particle of reclaimed land is 0.626; the research results can provide work to provide basic data for coal gangue filling reclamation.